Finding the Fourth Proportional to 1,147,806.55, 1,584,146.25 and 664,687.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147,806.55 : 1,584,146.25 = 664,687.31 : x
2. Step 2: Convert to fraction form
   1,147,806.55/1,584,146.25 = 664,687.31/x
3. Step 3: Cross multiply
   1,147,806.55x = 1,584,146.25 × 664,687.31
4. Step 4: Simplify right side
   1,147,806.55x = 1,052,961,906,235.65
5. Step 5: Solve for x
   x = 1,052,961,906,235.65/1,147,806.55
6. Step 6: Final answer
   x = 917,368.79